Detailed Product Description (Steel Pipes)Boiler TubeStandard: 1) American Society of Mechanical Engineers:ASME SA-106, ASME SA-192M, ASME SA209M, ASME SA-210M, ASME SA-213M2) Deutsche Industrial NormenDIN 171753) China Nation Standard:GB 3087, GB 53104) Japanese Industrial Standard:JIS G 3461